Take equal parts of I and II and 6 parts of water. If more contrast is needed, take equal parts of I and II and 3 parts of water, with 5 drops to the ounce of a 1/10 solution of bromide of potassium.
Metol And Hydrochinon Developer.—
| I.— | Pure hot water | 80 ounces |
|---|---|---|
| Metol | 1 ounce | |
| Hydrochinon | 1/8 ounce | |
| Sulphite soda, crystals | 6 ounces | |
| II.— | Pure water | 80 ounces |
| Carbonate soda, crystals | 5 ounces | |
| To develop, take of | ||
| Pure water | 2 ounces | |
| Solution No. I | 1 ounce | |
| Solution No. II | 1 ounce | |
Metol-bicarbonate Developer.
| Metol | 1 ounce |
| In water | 60 ounces |
| Then add | |
| Sulphite of soda, crystals | 6 ounces |
| Bicarbonate of soda | 3 ounces |
| To prepare with hydrometer, mix | |
| Sulphite of soda solution, testing 75 | 30 ounces |
| Bicarbonate of soda solution, testing 50 | 30 ounces |
| Metol | 1 ounce |
| Dissolved in 12 ounces water. | |
Ferrous-oxalate Developer.
| I.— | Oxalate of potash | 8 ounces |
|---|---|---|
| Water | 30 ounces | |
| Citric acid | 60 grains | |
| Citrate of ammonia solution | 2 ounces | |
| II.— | Sulphate of iron | 4 ounces |
| Water | 32 ounces | |
| Sulphuric acid | 16 drops | |
| III.— | Citrate of ammonia solution saturated. | |
Dissolve 1 ounce citric acid in 5 ounces distilled water, add liquor ammonia until a slip of litmus paper just loses the red color, then add water to make the whole measure 8 ounces.
Add 1 ounce of II to 2 of I, and 1/2 ounce of water, and 3 to 6 drops of 10 per cent solution bromide potassium.
To develop, first rinse developing dish with water, lay film or plate down, and flow with sufficient developer to well cover. Careful attention must be given to its action, and when detail is just showing in the face, or half-tone lights in a view, pour off developer, and well wash the film before placing in the fixing bath.